For more than a century, scientists have debated whether intelligence is mostly a product of nature or nurture. Identical ...

Identical twins who were raised apart may have IQ differences similar to those of total strangers, according to new research.

There’s a common assumption that intelligence is largely determined by genetics. After all, previously published studies ...

Identical, or monozygotic, twins develop from the same fertilized egg that splits into two. These twins are the same sex and share the same genes. Sometimes called paternal twins, identical twins ...

Sarah and Aimee Charlwood are identical twins. They didn't spend a day apart until they were 16. They share the same ...

Most twins have two identities: The one they share with their twin brother or sister as part of a pair, and the one that they enjoy all on their own. Most twins enjoy being a twin since it is a ...